My favourite branch of philosophy is metaphysics. For those who do not know, metaphysics can probably without too much oversimplification be described as the study of how our perception and knowledge of the universe comes to us. Physics is the study of the physical world - how it works, what it is made of. Metaphysics looks at what is behind the perceived reality. Or more accurately, what is beyond it, since the prefix meta literally means beyond.
There are many different theories of metaphysics, some of them quite weird. Most people are not in the least bit interested in metaphysics. And I have to admit that even though I like the subject, I can not really blame them for thinking as they do. Some of it is quite difficult to get your head around. Triviality can be so much more fun, and more immediately satisfying.
So when you interact as a philosopher with other people, you find yourself straying more and more into the realms of moral philosophy. Such questions as "Is it ever right to tell a lie?", or "Should we allow children in Africa to starve?" are more interesting to most people than, for example, "Does our perception of the world subsist in a priori or a posteriori data?"
For me it is absolutely clear which are the most interesting questions.
Besides, moral philosophy can often get you into trouble. People tend to read their own agendas into what you are saying. This happens particularly in discussions on the internet. People try to "read between the lines", in other words, they try to find out what your underlying, unspoken reason is for saying what you say, or for bringing up a question. Maybe you are even doing that now? Maybe you are thinking, Why is filosofia talking about this? What is her ulterior motive?
Usually people conclude that you must be trying to sell them something, and that you are at any moment going to start your "pitch". Or even worse, especially in moral philosophy, they sometimes think you are going to start trying to convert them to your religion. Even more if you actually happen to mention the words religion or god, which, after all, are sometimes likely to crop up when discussing issues of morality.
It then can happen that a person replies in the discussion, not to what you actually said, but to what they thought you said, which can lead to some amusing and quite heated, but ultimately pointless, exchanges.
I usually say to people, let's try to just concentrate on the words that are said, and not look for hidden meanings all the time. But a lot of the time it does no good. People think you mean something by it.
So that's why I prefer metaphysics.